Answer
$300\pi$ ft/min
Work Step by Step
One complete revolution is the same as $2\pi$ radians, hence: $\omega=600rpm=600\cdot2\pi=1200\pi$ rad/min
$r=3 in=0.25ft$
We know that $v=r\omega$, hence here: $v=0.25\cdot1200\pi=300\pi$ ft/min
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